Angles one and two are supplementary angles. Angle M one is 4Y +7 and angle M2 is 9y+4 bond angle M2

Answer 1

Supplementary angles add up to 180°, so ...
4y + 7 + 9y + 4 = 180
13y = 169
y = 13

your two angles are 59° and 121°

(notice 59+121 = 180)